Answer:
280000J
Explanation:
The heat required can be calculated using the following equation
[tex]Q=mC(T_2-T_1)[/tex]Where m is the mass, so m = 7 kg, C is the specific heat capacity, so C = 4000 J/Kg °C, and T2 and T1 are the temperatures, so T1= 7 °C and T2 = 17°C.
Therefore, by replacing the values, we get:
[tex]\begin{gathered} Q=(7kg)(4000\text{ J/kg \degree C\rparen\lparen17 }\degree C-7\degree C) \\ Q=280000\text{ J} \end{gathered}[/tex]Then, the answer is 280000J
